Defense secretary’s comments seen as oblique warning on Russian-sponsored hacking of U.S. political institutions

OXFORD, England—Secretary of Defense Ash Carter said the U.S. and its partners wouldn’t ignore Russia’s “efforts to interfere with our democratic processes,” issuing an oblique warning to the Kremlin amid accusations of Russia-sponsored hacks on U.S. political institutions during the presidential election.

Mr. Carter, who made the comments on a trip to the U.K., didn’t directly address allegations that Russia hacked the Democratic...

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